Construction of the Cell Membrane



7.3 DR part1 Name____________________Hr___

Construction of the Cell Membrane page 182

DRAW Figure 7-12 and LABEL its parts:

1. What are the two functions of the cell membrane?

1.________________________________________________________________

2.________________________________________________________________

2. What is the doubled layered sheet of cell membrane called?___________________

3. How many layers make up the lipid bilayer? _________

4. The lipid bilayer provides ___________ and a __________ barrier between cell and its environment.

5. Name two other molecules that are part of the cell membrane.

1...__________________ 2.___________________

6. What are the functions of the proteins in the cell membrane? _______________________

7. What is the function of the carbohydrates that are part of the cell membrane?

_______________________

8. What type of organisms have cell walls? Name 4. 1,_____________2._________________

3._______________ 4._________________

9. What substances are allowed to pass through the cell wall?_________________________

___________________________________________________________________

10. What is the main function of the cell wall?___________________________________

11. What is the composition of cell walls in plants?_________________________________

7.3 DR part2

Diffusion page 183

1. T or F. All living cells exist in liquid environments.

2. Why is important for the cell membrane to be in a liquid environment? ______________

_____________________________________________________________________

3. What is the cytoplasm composed of?________________________________________

4. What is a solution?____________________________________________________

5. What are the dissolved substances in a solution called?________________________

6. Define concentration of a solution. _______________________________________

__________________________________________________________________

7. What is the concentration of a solution that has 12 grams of salt in 3 Liters of water?

______________

8. What is the concentration of a solution that has 12 grams of salt in 6 Liters of water?

__________

Which solution (from question #7 OR #8) is more concentrated?______________

9. In figure 7-14, the picture illustrates the process of DIFFUSION. Explain in your own words what occurs, AND WHY at steps A, B, and C.

|Step A |Step B |Step c |

| | | |

10. Describe the process of Diffusion: _________________________________________ ______________________________________________________________________ ______________________________________________________________________

11. Describe the concentration of a solute when it has reached equilibrium: ______________ ______________________________________________________________________

12. Describe how diffusion and equilibrium work in a situation where a substance is present in unequal concentrations on either side of a cell membrane. ____________________________ _______________________________________________________________________

13. Why doesn’t diffusion require energy? ________________________________________

14. When equilibrium is reached, do particles keep moving or stop moving? ________________ Explain.__________________________________________________________________

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